Drill guide

ABSTRACT

A drill guide comprising a base, post fixed to the base, a carriage mounted on the post for movement toward and from the base, and an adjustable coupling on the carriage for securing a power drill thereto with the axis of the drill at a predetermined angle to the base, said carriage being adapted to be removed to enable using the drill independently of the base and to be restored without readjustment to said predetermined position. The coupling supports the drill forwardly and laterally of the post substantially centered with respect to the base and the base contains an opening through which the drill may be lowered into engagement with the work. There is means in the form of a second post for guiding the carriage as it is raised and lowered, a spring yieldably supporting the carriage above the base for movement toward the base, and means for limiting downward and upward movement of the carriage relative to the base. A gauge plate is adjustably mounted on the base below the opening and has on it intersecting gauge marks adapted to be aligned with the axis of the drill. A platen corresponding in configuration to the opening in the base is hingedly supported in the opening in which position its surface is flush with the surface of the base and for movement from the opening to a folded back position away from the opening.

United States Patent [1 Boyajian Oct. 1,1974

[ DRILL GUIDE [76] lnventorz Alfred Boyajian, PO. Box 811, ManhattanBeach, Calif. 90266 22 Filed: Aug. 10, 1973 21 Appl. No.: 387,471

Primary Examiner-Francis S. Husar Attorney, Agent, or FirmDike,Bronstein, Roberts, Cushman & Pfund [5 7] ABSTRACT A drill guidecomprising a base, post fixed to the base, a carriage mounted on thepost for movement toward and from the base, and an adjustable couplingon the carriage for securing a power drill thereto with the axis of thedrill at a predetermined angle to the base, said carriage being adaptedto be removed to enable using the drill independently of the base and tobe restored without readjustment to said predetermined position. Thecoupling supports the drill forwardly and laterally of the postsubstantially centered with respect to the base and the base contains anopening through which the drill may be lowered into engagement with thework. There is means in the form of a second post for guiding thecarriage as it is raised and lowered, a spring yieldably supporting thecarriage above the base for movement toward the base, and means forlimiting downward and upward movement of the carriage relative to thebase. A gauge: plate is adjustably mounted on the base below the openingand has on it intersecting gauge marks adapted to be aligned with theaxis of the drill. A platen corresponding in configuration to theopening in the base is hingedly supported in the opening in whichposition its surface is flush with the surface of the base and formovement from the opening to a folded back position away from theopening.

28 Claims, 13 Drawing Figures FATENTED BE? 7 74 mama FIG.|

FIG.6

FIG.4

PATENTEU 3.838.935

sum w 4 FIGJB DRILL GUIDE BACKGROUND OF THE INVENTION Drill guides forsupporting and steadying a power drill for drilling workpieces arenumerous in the art as illustrated in such US. Pat. Nos. as Pugsley,2,997,900, Halbreich, 1,316,027 and 1,316,028, Shulters, 2,883,891,Daniels, 2,831,376, Jepson, 2,909,085 and 2,680,435, and others.

The drill guide of this invention while embodying in general thestructural make-up of the drill guides disclosed in the aforesaidpatents is designed to enable accurately disposing the drill with theaxis of the bit at a predetermined angle with respect to the work,remove the drill from the guide for use independently thereof andreplace it in said predetermined position without readjustment; toenable accurate alignment of the axis of the drill with intersectingcenter lines drawn on the work at the intersection of which a hole is tobe drilled; and to enable using the drill guide at times as a drillpress.

SUMMARY The drill guide of this invention comprises a base, a carriage,means mounting the carriage on the base for movement toward and from thebase, said carriage being removable from said mounting means, a couplingmounted on the carriage for movement therewith to which a power drilltogether with a drill bit is adapted to be secured, and spring meansyieldably supporting the carriage above the base for downward movementtoward the base, said coupling being characterized in that it isadjustable on the carriage to dispose the drill in a predeterminedposition with the axis of the drill bit disposed at a predeterminedangle to the base such that after such adjustment the carriage may beremoved from the mounting means to enable using the drill independentlyof the supporting base and replaced without having to make readjustmentto restore the drill bit to said predetermined position. The meanssupporting the carriage on the base comprises a post fixed in an uprightposition to the base and the means for yieldably supporting the carriageabove the base is a coiled spring disposed on the post between thecarriage and the base. There is a second post secured in an uprightposition to the base withwhich the carriage is slidably engaged andthere is on the second post means for limiting the downward movement ofthe carriage on the base and means for limiting upward movement thereof.The coupling means may comprise a universal joint; for example, a balland socket connection. Optionally, the coupling is comprised ofhorizontally aligned screws extending through the carriage and threadedinto the coupling and vertically aligned screws threaded through thecarriage above and below the horizontally aligned screws and abuttingthe coupling. The posts are fixed to the base along one side and thecoupling supports the drill between the posts with respect to the frontand back of the base and substantially midway between the sides thereofso as to be substantially centered on the base. The base contains anopening below the bit which affords access of the drill bit to the work,affords the operator a clear view of the workpiece, hole locating lines,gauge lines, facilitating matching of the hole locating lines with thegauge lines. A gauge plate is mounted on the base below the opening onwhich there are intersecting gauge lines adapted to be adjusted to alignthe intersection of said lines with the axis of the drill bit. To avoidparallax the gauge lines extend down to the surface of the work. Aplaten corresponding in configuration to the opening in the base ishingedly supported in the opening, in which position its surface isflush with the surface of the base and for movement from said opening toa folded back position in whichit rests on the base rearwardly of theopening. The platen when disposed in the opening adapts the drill guideto use a drill press.

The invention will now be described in greater detail with reference tothe accompanying drawings wherein:

FIG. I is a perspective view of the drill guide as used for drillingholes in workpieces upon which it is positioned showing a power drilland bit mounted thereon in dot and dash lines;

FIG. 2 is a perspective view of the base of the drill guide showing thebase converted to use as a drill press;

FIG. 3 is a perspective view similar to FIG. 2, showing the posts whichmount the carriage for the power drill disposed transversely of the baserather than longitudinally thereof;

FIG. 4 is a plan view of one form of gauge plate;

FIG. 5 is an alternative form of gauge plate;

FIG. 6 is still another form of gauge plate;

FIG. 7 is a section taken longitudinally of FIG. I on the line 7-7 ofFIG. 1, showing the base of the drill guide with the platen folded backso as to enable its use as a drill guide;

FIG. 8 is a corresponding view showing the platen folded forwardly foruse of the drill guide as a drill press;

FIG. 9 is a plan view of FIG. 7;

FIG. 10 is an elevation, to somewhat larger scale, taken at the leftside of FIG. 1, showing one form of coupling to dispose the axis of thedrill perpendicular to the base and to the work support;

FIG. 10a is an elevation of the coupling taken on the line l0al0a ofFIG. 11;

FIG. 11 is a view partly in section and partly in elevation taken on theline 11-11 of FIG. 10;

FIG. 12 is a plan view of a ball and socket coupling; and

FIG. 13 is an elevation of the ball and socket coupling shown in FIG.12.

Referring to the drawings (FIG. 1) the drill guide comprises asubstantially rectangular base 10 along one side of which are mountedtwo posts 22 and 24, a carriage 30 mounted on the posts for movement toand from the base and a coupling 49 adjustably attached to the carriagefor securing a power-driven drill 14 together with a drill bit 15mounted in the chuck of the drill.

The post 22 is of circular cross-section and its lower end is set into ahole 25 (FIG. 7) drilled into the base and secured therein, for example,by a set screw 29. The post 24 is of non-circular cross-section havingdia metrically disposed flat surfaces 26-26 which are parallel to thesides of the base and arcuate portions 28-28 which are threaded. Thelower end of the post 24 is screwed into a threaded hole 27 in the base.The posts 22 and 24 are parallel to each other and to the sides of thebase and the one constitutes a support for the carriage and the other aguide and means for limiting the downward movement of the carriagetoward the base and the upward movement of the carriage from the base.The aforesaid means comprises a pair of nuts '44 threaded onto the post24 below the carriage and a nut 42 threaded onto the post above thecarriage. The post 24 may, if desired, be of circular cross-section.

The carriage 30 (FIGS. 1, 10 and 11) comprises a block 31 having at oneend vertically spaced arms 3232 containing aligned openings 3434 forslidably receiving the post 22 and at its other end a bifurcate 36comprising spaced tines 3838 adapted to slidingly receive the post 24. Acoiled spring 40 mounted on the post 22 between the base and thecarriage yieldably supports the carriage at the upper ends of the postsagainst the stop 42, permitting the carriage to be moved downwardly byapplication of pressure to the power drill attached to it.

The adjustable coupling 49 for attaching the drill to the carriage block31 is designed to support the power drill in a position with the axis ofthe drill chuck and the bit mounted therein substantially midway betweenthe posts 22 and 24 and substantially midway between the opposite sidesof the base so that the drill bit is substantially centered on the baseand so that downward pressure applied to the drill in use will not tendto overturn the drill guide. Additionally the coupling is designed toenable disposing the drill with-the axis of the drill bit at apredetermined angle to the base and to the work on which the base restsindependently of any lack of precision in the manufacture of the drillguide, the drill and- /or the drill bit so as to enable manufacturewithout maintaining high precision which would increase the cost of thedevice and further to enable removing the power drill together with thecoupling and the carriage from the post and using it independently ofthe drill guide for conventional drilling operations and then replacingit on the post for use in combination as a drill guide without having tomake readjustments to restore it to the predetermined position ofadjustment initially made. To insure this usage of the power drillindependently of the drill guide the carriage and coupling are made assmall as feasible and mounted to the housing of the drill at the outerside with respect to the normal use of the drill so as not to interferewith drilling operatrons.

To enable disposing the drill at the aforesaid predetermined positionthe adjustable coupling 49 is designed to enable making adjustmentsuniversally and in one form the adjustable coupling comprises, as shownin FIGS. 1, and 11, an attaching plate 51 adapted to be adjustablyconnected to the carriage block 31. The plate 51 has fastened to it byscrews 46 an adapter 51.1 designed to extend around the housing of thedrill and contains holes 51.2 for receiving bolts by means of which thedrill may be fastened to the adapter. The carriage block 31 is providedwith a pair of transversely spaced oversized smooth bore holes 4747 forreceiving bolts 61-61 and the plate 51 is provided with correspondinglyspaced threaded holes 6l.l61.1 for receiving the threaded ends of thebolts 616l. The carriage block contains also a pair of vertically spacedthreaded holes 47.147.1 through which screw bolts 67-67 are threaded toengage the inner ends of the bolts with the plate 51. The oversizedholes 4747 through which the bolts 61 extend permit the plate 51 to berotated about a horizontal axis and to be fixed at any desired positionby tightening of the screw bolts 6161 and the screw bolts 67-67 providefor rocking the plate 51 about a horizontal axis parallel to thecarriage. Thus the structure provides for substantial universaladjustment of the axis of the drill and/or the drill bit relative to thebase.

Alternatively, the adjustable coupling may comprise ball and socketmeans, as shown in FIGS. 12 and 13, wherein the coupling plate 51 has atone side a hemispherical protrusion 13 for engagement with ahemispherical recess 15 provided on the inner side of the carriage block31. An oversized hole 17 is drilled from the inner side of the carriageblock through the bottom of the hemispherical recess to the outer side.the outer end of which is counterbored to provide a hemispherical recess19. A bolt 21.1 is mounted through the oversized hole 17 with aspherical washer 23.1 at its outer end and a pair of nuts 25.1 arescrewed onto the bolt against the washer. A flat plate 27.1 is fastenedto the plate 51 and the plate 27.1 is provided with openings 29.1 forreceiving bolts 31.1 for fastening the drill housing to the plate 27.1.It is apparent that this construction enables adjusting the drilluniversally to dispose the axis of the chuck and/or the axis of thedrill bit at any desired predetermined angle to the base and to the workon which the base rests.

The hook 51.1 and flat plate 27.1 are illustrative of only two possibleforms of adapter for attaching a power drill to the coupling plate 51,it being considered as within the scope of the invention to design theconfiguration of the adapter plate according to the make of the powerdrill.

As previously related, the carriage 30 and the coupling plate 51 supportthe drill substantially centered between the posts 22 and 24 andsubstantially centered with respect to the opposite sides of the base toinsure stability. To provide for engaging the drill bit with the work onwhich the base is positioned the base is provided with an opening 20(FIGS. 1 and 9) from the forward side of substantially rectangularconfiguration which extends from the front side to a place rearwardly ofthe axis of the drill bit and has spaced parallel inner sides 49-49parallel to the sides and a transversely extending inner end 51.1parallel to the ends of the base. This opening 20 provides the operatorwith a clear view of the work, of the locating lines on the workpieceand the gauge marks on the gauge plate and the mating of these to eachother and in addition provides for the reception of a gauge plate 53which is designed to enable aligning the axis of the drill bit withlocating lines drawn on the workpiece marking the point thereon which isto be drilled. For receiving the gauge plate 53 the base has at itsunderside an upwardly extending recess 21 in which the gauge plate ismounted and secured by bolts 58. The gauge plate in one form, as shownin FIG. 4, comprises a flat plate 50 having along one side a straightedge and a deviating edge 64 beveled at 65. The straight edge 60constitutes one gauge line and a mark 66 on the beveled edge on a lineperpendicular to the straight edge 60 constitutes the other gauge line.The plate 50 contains spaced parallel slots 56-56 through which thescrew bolts 5858 are inserted for attachment to the base and these slotsare oversized so that the gauge plate can be adjusted forwardly andrearwardly, from side to side and angularly about a perpendicular axis.

The gauge plate may take other forms, as shown in FIGS. 5 and 6. Forexample, the gauge plate in FIG. 5

comprises a flat plate 52 having along one side a straight edge 60,deviating edges 72--72 and a hole 75. The straight edges 7272 intersectto form a point 73 which provides an index mark situated on a lineperpendicular to the edge 60.

The gauge plate shown in FIG. 6 comprises a flat plate 54 having astraight edge 60, deviating edges 72-72 intersecting at a point 73, anda hole 75.

To enable adjusting the drill to dispose the axis of the chuck and/orbit at an angle perpendicular to the base, there is provided, as shownin FIGS. and 11, a jig 71 comprising a spindle 73 provided with a shank75 at its upper end of such size as to fit into the drill chuck and atits lower end with a bearing surface 77. An arm 79 is connected at oneend to the spindle 73 and has at its other end a leg 81 which isradially spaced from and parallel to the spindle and at its lower end abearing surface 83 lying in the same plane as the surface 77. Thespindle axis and the plane of the surfaces 77 and 83 are at rightangles. The power drill is fastened by means of the coupling to thecarriage, the jig is mounted in the drill chuck and then the coupling isloosened whereupon the power drill is pushed down to engage the jigsurfaces 77, 83 with the workpiece and then the jig is rotated through180 about the axis of the spindle while maintaining the surfaces 77, 83continuously in contact with the work. As the jig is rotated thecoupling is progressively tightened to maintain the power drill in theperpendicularity imposed by the jig until the finalized position isobtained whereupon the coupling is clamped tight to lock the power toolin place. When the drill has been fixed in its perpendicular positionthe gauge plate 53, shown in FIG. 4, may then be moved into engagementwith the spindle 73 and fixed in place which will automatically alignthe intersection of the gauge marks 60 and 66 with the axis of thespindle 73 and hence of the drill bit when the latter is placed in thechuck. When using the guage plates shown in FIGS. 5 and 6 the gaugeplate is moved to a position to permit the lower end of the spindle 73to enter the hole 75 which automatically positions the gauge plate. Toposition the axis of the drill at angles other than perpendicular to thework a protractor may be employed.

At times especially for small workpieces it may be desirable to use thedrill guide as a drill press and so there is provided a platen 76 (FIGS.1, 2 and 3) which corresponds in configuration to the opening mounted inthe opening by means of a hinge 78 recessed into the upper surface ofthe platen and the base so that the upper surface of the platen and baseare uniformly flat. A ledge 49.1 along one side of the opening 20 andthe forwardly extending portion of the base at the other side providefor supporting the platen at the desired level. The platen 76 can betilted upwardly and rearwardly from the opening onto the surface of thebase rearwardly thereof when the device is being used solely as a drillguide. When the device is to be used as a drill press the platen istilted forwardly into the opening and to permit the drill to passthrough the work an oversized hole 80 is provided in the platen throughwhich the drill can pass. The platen may be removably mounted in theopening.

The posts 22 and 24, as shown in FIGS. 1 and 2, are supported along oneside of the base; however, it is within the scope of the invention tomount the posts at opposite sides of the base, as shown in FIG. 3, withthe post 22 at the left front side and the post 24 at the right frontside. When constructed in this fashion the opening 20 is situatedbetween the posts.

There is optionally provided at the rear end of the base an opening orrecess 82 of substantially rectangular configuration, across the opentop of which is hinged a cover 84. This recess is designed to provide areceptacle for extra drill bits, a chuck key, pencils, and the like.

To prevent sliding of the base on the workpiece during the drillingoperation friction pads 23 are secured to the lower side of the base atthe four corners.

It should be understood that the: present disclosure is for the purposeof illustration only and that this invention includes all modificationsand equivalents falling within the scope of the appended claims.

I claim:

1. A portable drill guide comprising a base, a car riage, means mountingthe carriage on the base for movement toward and from the: base,.saidcarriage being removable from said mounting means. a coupling mounted onthe carriage for movement therewith to which a power drill together witha drill bit is adapted to be secured, and spring means yieldablysupporting the carriage above the base for downward movement toward thebase, said coupling being characterized in that it is adjustable on thecarriage to dispose the drill in a predetermined position with the axisof the drill bit disposed in a predetermined angle to the base such thatafter said adjustment has been made the carriage may be removed from themounting means to enable using the drill independently of the supportingbase and replaced without having to make a readjustment to restore thedrill to said predetermined position and predetermined angle.

2. Apparatus according to claim 1, wherein the carriage and coupling isadapted to be attached to the drill housing in a position such as not tointerfere with the normal use of the drill when removed from the base.

3. A portable drill guide comprising a base, a post fixed to the base inan upright position, a carriage mounted on the post for movement thereonto and from the base, said carriage being removable from the post, acoupling mounted on the carriage for movement therewith to which a powerdrill together with a drill bit is adapted to be secured, and springmeans disposed on the post between the base and the carriage foryieldably supporting the carriage above the base for downward movementtoward the base, said coupling being charac terized in that it isadjustable on the carriage to dispose the drill in a predeterminedposition with the drill bit disposed at a predetermined angle to thebase, and such that after said adjustment has been made the carriage maybe removed from the post to enable using the drill independently of thebase and replaced without having to make a readjustment to restore thedrill to said predetermined position and angle.

4. Apparatus according to claim 3, comprising means for limiting upwardmovement of the carriage.

5. Apparatus according to claim 3, comprising means for limitingdownward movement of the carriage.

6. Apparatus according to claim 3, comprising a second post fixed to thebase in an upright position spaced forwardly and parallel to the firstpost and means on the carriage slidingly engaged with the second post.

7. Apparatus according to claim 6, wherein the second post is spacedforwardly of the axis of the drill bit.

8. Apparatus according to claim 6, wherein the coupling supports thedrill substantially midway between the posts with respect to the frontand rear ends of the base and substantially midway between the sides ofthe base.

9. Apparatus according to claim 3, comprising a second post fixed to thebase in an upright position spaced transversely of and parallel to thefirst post, and means on the carriage slidingly engaged with the secondpost.

10. Apparatus according to claim 1, wherein the coupling comprises auniversal joint.

11. Apparatus according to claim 1, characterized in that the couplingcomprises a ball and socket joint.

12. Apparatus according to claim 1, wherein the carriage contains pairsof horizontally spaced smooth bore holes and pairs of vertically spacedthreaded holes, and wherein two horizontally aligned screws extendthrough the smooth bored holes of the carriage and are threaded into thecoupling and two vertically aligned screws are mounted in the threadedholes in the carriage above and below the horizontally aligned holes andabut the coupling.

13. Apparatus according to claim 5, wherein the carriage has verticallydisposed, spaced parallel openings slidably engaged with the first postand a bifurcate slidably engaged with the second post.

14. Apparatus according to claim 6, wherein the first post is ofcircular cross-section and the second post is of non-circularcross-section and having screwthreaded portions for nut stops.

15. Apparatus according to claim 6, wherein the posts are fixed to thebase along one side, the coupling supports the drill between the postswith respect to the front and back disposition of the drill andsubstantially midway between the sides with respect to the side-tosidedisposition of the drill and the base contains an opening below the bitwhich affords access of the bit to the work, a clear view of thelocating lines on the workpiece and the gauge lines on the base.

16. Apparatus according to claim 15, wherein the opening extendsrearwardly from the front end of the base to the rear side of the axisof the bit.

17. A portable drill guide comprising a base, a post fixed to the basein an upright position, a carriage mounted on the post for movementthereon to and from the base, a coupling mounted on the carriage formovement therewith to which a power drill together with a bit areadapted to be secured, said coupling supporting the drill forwardly andlaterally of the post so as to be substantially centered on the base,and said coupling being adjustable to dispose the drill with the axis ofthe bit at a predetermined angle to the base, spring means on the postbetween the base and the carriage for yieldably supporting the carriageabove the base, said base containing an opening below the bit whichextends from the front of the base to behind the bit, and a gauge platemounted on the base below the opening on which there are intersectinggauge lines.

18. A portable drill guide according to claim 17, wherein said gaugeplate is adapted to be adjusted to align the intersection of saidintersecting gauge lines with the axis of the bit.

19. Apparatus according to claim 17. wherein the gauge plate containsslots through which screw bolts are received and threaded into the base,and said slots are oversized so that the gauge plate is adjustable in aplane parallel to the plane of the base. forwardly and rearwardly, fromside-to-side and angularly about a perpendicular axis.

20. Apparatus according to claim 17, wherein the gauge lines compriseedges of the gauge plate. one of which has on it a gauge mark situatedon a line which intersects the edge of the other at right angles.

21. Apparatus according to claim 20, wherein the gauge marks and edgesare located so as to extend to the bottom surface of the base adjacentthe surface of the workpiece.

22. Apparatus according to claim 17, wherein a platen corresponding inconfiguration to the opening in the base is hingedly supported in theopening. in which position its surface is flush with the surface of thebase. and for movement from said opening to a folded back position inwhich the surface rests on the base rearwardly away from the opening.

23. Apparatus according to claim 17, wherein a platen corresponding inconfiguration to the opening in the base is removably supported in theopening.

24. A drill guide according to claim 22, wherein the platen contains aclearance hole, the center of which is in substantial alignment with thevertical axis of the bit.

25. Apparatus according to claim 22, wherein there are shoulders alongthe inner opposite sides of said opening and the platen is adapted torest on said shoulders when occupying said opening.

26. Apparatus according to claim 1, wherein there are traction padssecured to the underside of the base.

27. The combination with a drill guide according to claim 15, of analigning device adapted to be inserted into the chuck of a drill, saidaligning device comprising a post adapted to be lowered into engagementwith the work and a radially extending arm extending from the posthaving an end coextensive with the lower end of the post, said devicebeing rotatable in the chuck and by continuous engagement of the postand the extension with the work operable to dispose the drill with theaxis of the chuck perpendicular to the work and as an aid to adjustingthe gauge plate so that the gauge lines intersect the axis of thealigning device.

28. Apparatus according to claim 1, wherein the base contains acompartment provided with a hinged cover. l

1. A portable drill guide comprising a base, a carriage, means mountingthe carRiage on the base for movement toward and from the base, saidcarriage being removable from said mounting means, a coupling mounted onthe carriage for movement therewith to which a power drill together witha drill bit is adapted to be secured, and spring means yieldablysupporting the carriage above the base for downward movement toward thebase, said coupling being characterized in that it is adjustable on thecarriage to dispose the drill in a predetermined position with the axisof the drill bit disposed in a predetermined angle to the base such thatafter said adjustment has been made the carriage may be removed from themounting means to enable using the drill independently of the supportingbase and replaced without having to make a readjustment to restore thedrill to said predetermined position and predetermined angle. 2.Apparatus according to claim 1, wherein the carriage and coupling isadapted to be attached to the drill housing in a position such as not tointerfere with the normal use of the drill when removed from the base.3. A portable drill guide comprising a base, a post fixed to the base inan upright position, a carriage mounted on the post for movement thereonto and from the base, said carriage being removable from the post, acoupling mounted on the carriage for movement therewith to which a powerdrill together with a drill bit is adapted to be secured, and springmeans disposed on the post between the base and the carriage foryieldably supporting the carriage above the base for downward movementtoward the base, said coupling being characterized in that it isadjustable on the carriage to dispose the drill in a predeterminedposition with the drill bit disposed at a predetermined angle to thebase, and such that after said adjustment has been made the carriage maybe removed from the post to enable using the drill independently of thebase and replaced without having to make a readjustment to restore thedrill to said predetermined position and angle.
 4. Apparatus accordingto claim 3, comprising means for limiting upward movement of thecarriage.
 5. Apparatus according to claim 3, comprising means forlimiting downward movement of the carriage.
 6. Apparatus according toclaim 3, comprising a second post fixed to the base in an uprightposition spaced forwardly and parallel to the first post and means onthe carriage slidingly engaged with the second post.
 7. Apparatusaccording to claim 6, wherein the second post is spaced forwardly of theaxis of the drill bit.
 8. Apparatus according to claim 6, wherein thecoupling supports the drill substantially midway between the posts withrespect to the front and rear ends of the base and substantially midwaybetween the sides of the base.
 9. Apparatus according to claim 3,comprising a second post fixed to the base in an upright position spacedtransversely of and parallel to the first post, and means on thecarriage slidingly engaged with the second post.
 10. Apparatus accordingto claim 1, wherein the coupling comprises a universal joint. 11.Apparatus according to claim 1, characterized in that the couplingcomprises a ball and socket joint.
 12. Apparatus according to claim 1,wherein the carriage contains pairs of horizontally spaced smooth boreholes and pairs of vertically spaced threaded holes, and wherein twohorizontally aligned screws extend through the smooth bored holes of thecarriage and are threaded into the coupling and two vertically alignedscrews are mounted in the threaded holes in the carriage above and belowthe horizontally aligned holes and abut the coupling.
 13. Apparatusaccording to claim 5, wherein the carriage has vertically disposed,spaced parallel openings slidably engaged with the first post and abifurcate slidably engaged with the second post.
 14. Apparatus accordingto claim 6, wherein the first post is of circular cross-section and thesecond post is of non-circular cross-section and having screw-threadedportions for nut stops.
 15. Apparatus according to claim 6, wherein theposts are fixed to the base along one side, the coupling supports thedrill between the posts with respect to the front and back dispositionof the drill and substantially midway between the sides with respect tothe side-to-side disposition of the drill and the base contains anopening below the bit which affords access of the bit to the work, aclear view of the locating lines on the workpiece and the gauge lines onthe base.
 16. Apparatus according to claim 15, wherein the openingextends rearwardly from the front end of the base to the rear side ofthe axis of the bit.
 17. A portable drill guide comprising a base, apost fixed to the base in an upright position, a carriage mounted on thepost for movement thereon to and from the base, a coupling mounted onthe carriage for movement therewith to which a power drill together witha bit are adapted to be secured, said coupling supporting the drillforwardly and laterally of the post so as to be substantially centeredon the base, and said coupling being adjustable to dispose the drillwith the axis of the bit at a predetermined angle to the base, springmeans on the post between the base and the carriage for yieldablysupporting the carriage above the base, said base containing an openingbelow the bit which extends from the front of the base to behind thebit, and a gauge plate mounted on the base below the opening on whichthere are intersecting gauge lines.
 18. A portable drill guide accordingto claim 17, wherein said gauge plate is adapted to be adjusted to alignthe intersection of said intersecting gauge lines with the axis of thebit.
 19. Apparatus according to claim 17, wherein the gauge platecontains slots through which screw bolts are received and threaded intothe base, and said slots are oversized so that the gauge plate isadjustable in a plane parallel to the plane of the base, forwardly andrearwardly, from side-to-side and angularly about a perpendicular axis.20. Apparatus according to claim 17, wherein the gauge lines compriseedges of the gauge plate, one of which has on it a gauge mark situatedon a line which intersects the edge of the other at right angles. 21.Apparatus according to claim 20, wherein the gauge marks and edges arelocated so as to extend to the bottom surface of the base adjacent thesurface of the workpiece.
 22. Apparatus according to claim 17, wherein aplaten corresponding in configuration to the opening in the base ishingedly supported in the opening, in which position its surface isflush with the surface of the base, and for movement from said openingto a folded back position in which the surface rests on the baserearwardly away from the opening.
 23. Apparatus according to claim 17,wherein a platen corresponding in configuration to the opening in thebase is removably supported in the opening.
 24. A drill guide accordingto claim 22, wherein the platen contains a clearance hole, the center ofwhich is in substantial alignment with the vertical axis of the bit. 25.Apparatus according to claim 22, wherein there are shoulders along theinner opposite sides of said opening and the platen is adapted to reston said shoulders when occupying said opening.
 26. Apparatus accordingto claim 1, wherein there are traction pads secured to the underside ofthe base.
 27. The combination with a drill guide according to claim 15,of an aligning device adapted to be inserted into the chuck of a drill,said aligning device comprising a post adapted to be lowered intoengagement with the work and a radially extending arm extending from thepost having an end coextensive with the lower end of the post, saiddevice being rotatable in the chuck and by continuous engagement of thepost and the extension with the work operable to dispose the drill withthe axis of the chuck perpendicular to the work and as an aid toadjusting the gauge plate so that the gauge lines intersect the axis ofthe aligning device.
 28. AppaRatus according to claim 1, wherein thebase contains a compartment provided with a hinged cover.